Supreme Court of United States.
MR. JUSTICE BLACK delivered the opinion of the Court.
Cranford P. Walker, owner of Patent No. 2,156,519, and the other respondents, licensees under the patent, brought this suit in a Federal District Court alleging that petitioner, Halliburton Oil Well Cementing Company, had infringed certain of the claims of the Walker patent. The District Court held the claims in issue valid and infringed by Halliburton. The Circuit Court of Appeals affirmed,
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